Check-valve.



A. INGRAM.

, CHECK VALVE. APPLIUATION FILED JUNE 16, 1910.

q vi-Wameo UNITED STATES PATENT orrlon.

ATKIN M. INGRAM, 0F MONTGOMERY, ALABAMA, ASSIG-NOR 0F ONE-HALF TO WILLIAM J. GARDNER. 0E MONTGOMERY, ALABAMA.

CHECK-VALVE.

Specification of Letters Patent.

Application filed .Tune 16, 191G. Serial No. 567,309.

To all whom it may concern:

Be it known that I, A'rnIN M. INGRAM, a citizen of the United States, and a resident of lilontgomery, in the county of Montgomery and State of Alabama, have invented certain new and useful Improvements in Check-Valves, of which the following is a full and clear specification, reference being had to. the accompanying drawings, in which--- Figure 1 is a vertical section of the valve structure complete; and Fig. 2 an elevation of the upper half of the. inner side of the removable valve carrying head or flange.

This valve structure is especially designed for use with heavy acids, especially sulfuric and other vitriolic liquid bodies, it being especially designed to be placed in the pipe line between the storage tank and a receptacle known as an egg, from which egg the acid is pumped or forced by air pressure; and the object of this invention is to render the valve self-opening as well as self- 'closing and to improve its general structure,

as more fully hereinafter set forth.

The valve casing a is made any suitable shape and area and is provided with an outlet 6 for the liquid and inlet 0 for air when the valve is to be used with an air forcing means. The front end of the casing is closed by a head (Z which is clamped rigidly to the casing by suitable bolts, the joint being rendared non-leakablc by rabliieting the inner annular corner of the valve casing at e to receive a similarly shaped annular shoulder f-on the head. With a joint of this construction, if the contacting surfaces are fitted and dressed nicely, packing material is rendered unnecessary.

The inlet g extends through the center of the head, and around the inlet on the inner face of the head is formed an annular flange It which serves as the valve seat. The seating-surface of this valve seat is in two parts, namely, the annular beveled portion and the annular :ilat face The valve plate is pivotally depends from a pair of lugs Z projecting inwardly from the head (Z at points above the valve, seat, these lugs being arranged upon opposite sides of a vertical line drawn through the center of'the valve seat and being adapted to receive the lateral pivots oi"l1.'uu1iions m of the valve plate.

The trunnions or pivots rest in notches it that when there is no pressure in the valve casing the valve plate Will normally swing away from the valve seat, the valve being thereby kept normally open. The notches a are elongated sufliciently to permit the trunnions to have a bodily movement forward and backward therein so that'when the valve is permitted to open it will move a certain distance bodily away from the valve seat and thus permit the free passage of the liquid, this being especially advantageouswhen the valve is used with heavy liquids such as sulfuric and nitrous acids.

The pivoting of the valve plate at a point back of the valve seat causes the valve plate to assume a position inclined upwardly and backwardly when it is forced to its seat, as shown in dotted lines in Fig. 1. This necessitates the inclining of the double valve seat 2' j in the same direction so that the corresponding seating surfaces 0p on the valve plate shall scat properly when the valve is closed. This provision of a double seating surface, one inclined with respect to the other renders the valve non-leakable. This idea of inclining the valve seat upwardly and inwardly and the making of the lower portion of the beveled portion 6 of the valve seat shorter or narrower, has an important advantageous result when the valve is used with heavy liquids in that it permits the free and quick passage of any solid or foreign matters that may be carried into the valve along with the acids, and this free flow of the liquids is still further promoted by the fact that the valveremains wide open when not under pressure of the air.

I prefer constructing the valve through-' out; except the bolts and nuts, of an alloy of lead and antimony, in order to render it. non-corrodible. It will be observed that a further advantageof my Valve structure is that l avoid all pockets and crevices that might form pockets for the lodgment of foreign substances.

Having thus fully descrilnecl my invention, What I elaim as new, and clesir to secure by Letters l alent, is- I The combination of a valve ing a horizon l'al inlet having an annular valve seat pmjecting therefrom into the cusing, said, valve seal. inclining upwardly 21110. lnwzufclly, a pivot supyort locateel Wl'lLhin the casing" at a point above be valve sealgavalve plate having trnnuions hung in saicl and adapted to freely swing therein :0 ancl from the said valve seat, the axis of its trunnions being locale-(l above and beyond the valve semi so that the valve plate shall n01- casing havseat to permit said trunnlons to have amove ment fiowarcl and frnm the seat simultaneously wlth the movement of the valve plate respectwely inward and fmm the seat.

In stimony whereof I hereunto afllx my surnai eu'e 1n, the presence of two wltnesses thls Lil lay of June 1910.

A ll'illl Evil.- llTl G'Rl lllll.

W. J. GARDNER.) J. U. BROWN. 

